MATLAB: Output arguments not getting assigned

argumentsassignedcallnumbersoutputprime

I keep getting the error Output argument "prime2" (and maybe others) not assigned during call to "sum_of_primes". Can someone explain why?
 % This function takes an even integer greater than 2
    % and expresses it as the sum of two prime integers
 function [prime1, prime2] = sum_of_primes (num)
 %%If input is an even integer greater than 2
if (mod(num,2)  == 0) && (num > 2)
    %%Initializing vector x to numbers from 1 to num
        % any non-prime number is set to 0
    for n = 1:num
        if (isprime(n) == true)
            x(n) = n;
        end
    end
    %%Initializing vector z as array x without the zeros
        % z will then be a vector of prime numbers
    z = (x(x~=0))';
    z = z<num;
    %%Doing things and stuff
    for n = 1:size(z)
        prime1 = z(n);
        if (isprime(num-prime1) == true)
            prime2 = num-prime1;
            break;
        end
    end
else
    disp('Please enter an integer greater than 2.')
end
end

Best Answer

I fixed it. z = z<num; was messing up the initialization of vector z. I didn't need this line anyways.
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